01: /**
02:    A line item in an invoice.
03: */
04: public interface LineItem
05: {
06:    /**
07:       Gets the price of this line item.
08:       @return the price
09:    */
10:    double getPrice();
11:    /**
12:       Gets the description of this line item.
13:       @return the description
14:    */   
15:    String toString();
16: }